CPU cooler

ABSTRACT

A flow field of impinging jet array based CPU cooler is provided. The cooler comprises a cooling base having an array of recess on a top surface, the cooling base being rested on CPU; a substantially similar sized orifice plate having an array of orifice each corresponding to recess, orifice plate being above cooling base by a separation distance; and a fan with cooling base and orifice plate enclosed therein and secured on the CPU. An activated fan provides coolant flow that produces the vortical flow structures with enhanced turbulence on each recess by impinging air jets onto the recesses through the orifices, thereby convecting the heat flux generated from the running CPU. Also, the orifices may be oblique other than vertical.

FIELD OF THE INVENTION

[0001] The present invention relates to central processing unit (CPU) cooler and more particularly to such a CPU cooler with improved characteristics.

BACKGROUND OF THE INVENTION

[0002] It is readily understood that a running CPU of computer generates a large amount of heat flux. Conventionally, a cooler is used to control the risen temperature of the running CPU to an acceptable degree so as to maintain a normal operation of the CPU and thus the computer. A conventional CPU cooler comprises a fan, a cooling base rested on CPU, and a metal plate above the cooling base on which a plurality of parallel fins with good heat convection and/or conduction capability is attached so as to effectively dissipate heat generated from a running CPU.

[0003] It is also understood that the operating speed of CPU has become more and more fast as technology evolves. And this in turn causes high heat flux generation from a running CPU. Hence, the effective method with improved dissipation of the heat generated from a running CPU is still a task under continuous pursuit. Thus, it is desirable to provide an improved CPU cooler in order to achieve such task, which is not done by the prior art.

SUMMARY OF THE INVENTION

[0004] It is an object of the present invention to provide a flow field based cooler for a CPU. The cooler comprises a cooling base having an array of recess on its top surface. The cooling base is secured on the CPU above which a substantially similar sized orifice plate, having an array of orifices each corresponding to the recess is attached. A tab at each side of the cooling base is used to clamp the orifice plate and the cooling base with a predetermined separation distance. An electrical fan above the cooling base and the orifice plate is enclosed therein and secured on the CPU. When the fan is operative to provide the required coolant mass flow, the impinging jets are generated through the orifice plate and directed toward the recesses within which the turbulence and vorticity of wall-jet flow are enhanced, thereby dissipating the heat flux generated from the running CPU.

[0005] In one aspect of the present invention, the orifices are vertical.

[0006] In another aspect of the present invention, the orifices are oblique.

[0007] The above and other objects, features and advantages of the present invention will become apparent from the following detailed description taken with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0008]FIG. 1 is an exploded view of a first preferred embodiment of CPU cooler according to the invention;

[0009]FIG. 2 is a cross-sectional view of the FIG. 1 cooler showing an air path formed in the cooler while fan is running;

[0010]FIG. 3 is a cross-sectional view of a second preferred embodiment of CPU cooler according to the invention showing an air path formed in the cooler while fan is running;

[0011]FIG. 4 is top plan view showing the vortical flow structures formed on the recess after the jet impinges onto the recess; and

[0012]FIG. 5 is a cross-sectional view of a third preferred embodiment of CPU cooler according to the invention showing an air path formed in the cooler while fan is running.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Referring to FIG. 1, there is shown a first preferred embodiment of flow field of impinging jet array based CPU cooler in accordance with the invention. The CPU cooler comprises a square cooling base 1 having an array of round recess 11 on top surface, the cooling base 1 being rested on CPU 7, a substantially similar sized orifice plate 2 having an array of orifice 21 each corresponding to a recess 11 and an elongate tab 22 at each side being rested on a side of cooling base 1 so that the orifice plate 2 is provided above the cooling base 1 with a predetermined separation distance, and a fan 3 with cooling base 1 and the orifice plate 2 enclosed therein and secured on CPU 7 by clinging onto side projections 71.

[0014] Referring to FIG. 2, the operation of the invention will now be described below. The activating fan 3 generates the coolant flow with an air path 5, which in turn generates the vortical flow structures 51 on each recess 11 by impinging jets onto recesses through orifices 21. Thus, the heat flux generated from the running CPU 7 is effectively convected.

[0015] Referring to FIGS. 3 and 4, there is shown a cross-sectional view of a second preferred embodiment of CPU cooler according to the invention. The difference between the first and second embodiments is that the orifice 21 is disposed corresponding to the center of recess 11 in the first embodiment while the orifice 23 is disposed corresponding to an edge of recess 11 in the embodiment. Thus, a pair of opposite circulating vortical wall-jet flows 52 is formed on recess 11 that is the second embodiment (see FIG. 4).

[0016] Referring to FIG. 5, there is shown a cross-sectional view of a third preferred embodiment of CPU cooler according to the invention. The difference between the first and the third embodiments is that the orifice 21 is vertical in the first embodiment while the orifice 24 is oblique in the third embodiment.

[0017] While the invention herein disclosed has been described by means of the specific embodiments, numerous modifications and variations could be made thereto by those skilled in the art without departing from the scope and spirit of the invention set forth in the claims. 

What is claimed is:
 1. A flow field based cooler for a CPU, the cooler comprising: a cooling base having an array of recess on a top surface, the cooling base being rested on the CPU; a substantially similar sized orifice plate having an array of orifice each corresponding to the recess and a tab at each side being rested on a side of the cooling base so that the orifice plate is provided above the cooling base by a predetermined separation distance; and a fan with the cooling base and the orifice plate enclosed therein and secured on the CPU; wherein the fan is operative to generate vortical flow structures with enhanced turbulence on each recess by impinging jets onto the recesses through the orifices, thereby convecting the heat flux generated from the running CPU.
 2. The cooler of claim 1, wherein the orifices are vertical.
 3. The cooler of claim 1, wherein the orifices are oblique. 